check to make sure "last touched" isn't engaged on your snap size.
what this does is changes your snap to the last size of a note or clip you touched.
you can see how this works here @ 0:40 seconds
http://www.youtube.com/watch?v=ruAnAPR6-hQ or you have auto zoom enabled and its changing with zooming/different zoomed views.
theres also a really cool snap setting if you hold the "N" key you can have another snap setting in memory.
this is helpful if you normally use 1/2 for your snap but want to use 1/16.
rather than changing the snap value back and forth you can just hold down N and temporarily have that other setting.
grid works perfectly. turn off last touched and see if that makes a difference :)
autozoom to as I said previously, zooming in changes snap values.
there's a few video out on the changes in snap in x2.
in my opinion they fixed every problem with snap there was in x1 and made it ten times better.
snap is my fav feature in x2.
but it took me awhile to study all the settings to use it to my potential.
I do recall thinking that it wasn't working correctly until I learned all the changes.
then I was amazed at the amount of thought they put in to it in this version.